Linkage



FIG. 1 is a perspective view of a linkage constructed in accordance with my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a right side view thereof, with the opposite side to that shown being a mirror image; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a linkage, as shown and described. 